Pitman



c. s. WRIGHT NOV.' 25, 1930.

PITMAN 2 Sheets--Sheet l l Filed Nov. a. 26

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A TTORNEY' Nov. 25, 1930, c. s. WRIGHT PITMAN 2 Sheets-Sheet 2 Filed ov, 8, 1926 a a www w y. -..l W M a) n m 9 @A 1 w illf/ P mm w @Y M2 1 5 v V., F/ @i 6 o-\ .MLI .IxHIIIIIH Il m lm 4 n TIB n f 5 -r..-. ,Li Il lll, |||r ...T I l I Il .I Il |l Il I| Patented Nov. `25, 1930 oF TOLEDO, omo,v A ooaronmioiv or emee STATE-s omo s PITMAN" Application med mvember` `My invention relates tozpitmen adapted for general use, but .particularly designed for use in well-drilling apparatus as a connection between one end of the walking beam and the band-wheel crank-shaft. 1

One object of this invention is to provide for the lower ends of pitman bearings which f will stand the large thrustsv imposed upon spitman bearing and holding `it suspended 1 them. Another object is to provide means for automatically removing the top member of a above the wrist pin as soon as the locking key for the said member has beenl moved out of i locking'position, wherebythe pitman may be readily removed from `its bearing." Other objects relate `to details which will be better understood after they have been described. y

`Referring to the accompanying drawings, Fig. l is a Aside 4view of the lower end of a pitman provided with my improvement, the

`wrist-pin being shown therein in end elevation; Fig.2, an elevation, the view being .taken from` the right hand `side of Fig. l'

Fig. 3, a section on the line III-lll on Fig.

,2; Fige, a view like'Figgl, butshowing a `modication thereof; Fig. 5, a section on the 1 1 `line V-V on Fig. 4e; and Fig. 6, a section on the line VI-VI on Fig. 4e, the wrist-pin being shown in side elevation and broken olf.

On Figs. l, 2 and 3 of the drawings, l and ,2 designate two metal channel members or U-bars spaced apart to form the longitudinal sides or edgesof a pitman. The backs ofthe e e channel `members face outwardly, and the a5 hollows are opposedor face each other. `The channel members are spaced apart by the metal blocks or spacers 3 and 4e seated between the flanges or side members of the channel e members and. securedto the channel members 1 40 by bolts 6 and 7 extending through both the channel members and the intervening blocks. The block 4 comprises a vertical member 7 running centrally and longitudinally of the 1 pitman and embracingtheintermediate portions of the said bolts 6. From the member 7 horizontal ribs 8 extend laterally in both directions, the ribs being preferably opposite the bolts 6.

VThe upper or inner end of the block 3 is provided with a nearly semicylindrcal upthe lower side ofthe wrist-pint).

channel member; 2.th`e "arme llfbeing carried by the pivoter .pin ,13 in the said earsQand PATENTs-OFFIC' i .-1 K oLYnE s. WRIGHT, oF `TOLEDO, oHIo, AssIGnontT'o THEiNATIoivAL s'UrrLY oolvrrnnxg 1 'extending enough ee1etj1sf1fegthe members. 1

other eid. of @helm-1i; :being eenheden :the L ycoilfedf spriirgglwhich has fits upper 'endconnelcted to `a rod 16 passedfthroughone of the upiefribs 8 endfprvidedwitha mit lfrs# ingon the top fof. the said ribf Thelrib's'S be- :1w` the we ribes end-pn me eide Ofhemmf berv 7 are, discontinuous atthe points 19"to .accommodatethe saidlinl and spring. When A thefmember 1Q is free. tofmove thefs'pringl.,

nite je free from the mise 'pie 9, endheldsfnji 7e s suspended asfshowninFig.v l. e

20`is ajwedge ly` in,f`:, f"abovetheV bearing 'l memberf l() and slidable' injthe .upper-end of in the member l,beyon`dlwhichfit entends."

" VThe end of wedgejbfeyond themember i l"V surronndedsL by the coiled [conical `spring A 21: seated between thefv channel member" l s and, the washer 22`he`ld from` escaping by.

thecross-pinl'ZuBb.. Jv'llhejlower edgelof the j wedge A"has the steep cam or `incline arffranved ytofengagel the Alug 2561i the 'top of the vthe member `10 fis prqperly `seemed theluge s earingl member 1Q andforce thenlatter i ',lto its j proper Contact with thewrist pin'}9.

e when` the wedge is driven to the leiten `When "57 shouldrest againstthelower falcegof `the wedge at ,the right ,of the incline-"24,asshown on the wedge at the left ofthe said incline when, the bearingmember 10 -is lifted, as

"i shown in full linesinl 1.1";The`spring 21 exerts a pressuref tendingto fpull the "wedge` ffurtherjto the left, whereby itl acts as af rlguide and sustain the thrustof the wedge. 00

The wrist pin 9 eXerts at times large thereof engageable by the first bearing memthrusts against the bearing member 10, these ber, and means cooperating with the second thrusts being so great that the key 2O might block and the movable bearing for holding be forced toward the right out of its lockthe movable bearing in operative position.

f ing position, shown in Fig. 4, unless the inclination of the key where it contacts with the lug 25 isvery small. It is desirable that the movable member 10 shall move upwardly for quite a distance away from the wrist pin as shown in'Fig. 1 in order that the connection between the wrist pin and the pitman may be easily made. In order to provide the necessary space between the bearing members for the wrist pin, the steep incline 24 has been provided. As the ineline 24 is too steep to serve by its contact with the lug 25 as a lock for holding the movable bearing against the wrist pin, the comparatively slight incline at the right hand end of the incline 24 has been provided so that when the key 20 is driven to the left to its normal locking position the said slight incline will rest upon the top of thel lug'25. This incline is so slight that any pressurel which the wrist pin can exert upwardly is not sufficient to move the key to the right or out of the said locking position.

In Figs. 4, r5 and 6, the structure is substantially as in Figs. 1, 2 and 3 except' as to the means for guiding and supporting the upper bearing member 10a and some of the details of the wedge 20a and the parts adjacent thereto. Parts which are the same as those on Figs. 1, 2, and 3 bear the same reference numerals while parts analogous to those on Figs. 1, 2 and 3 bear the same refp erence numerals followed by the letter a.

The bearing member 10a has the upright stem 11Et which is connected to the lower end of the spring 15 by the C-shaped link 14a, the bearing 10a being guided up and down by the interior surfaces of the channel members 1 and 2, as shown in Fig. 4. The wedge slides in the slot 26a in the block 4a. The stem 11L is slotted, its members 28 being slidable in slots 27 in the block 4a. The wedge 20a works between the top wall 29 of the `slot 26a and the `bottom wall 30 at the bottom of the slot between the members 28 ofthe stem 11a. The wedge is shown with `the holes 31 into which across-pin 32 may be inserted close to the member 1 to prevent themovement ofthe wedge to the right and the release of the vbear-ing -member 10a. 11 @1amt I n ya'v metallic Pitman, a pair of individual channel bars extending longitudinally of the pitman, Lablock distinct fromthe bars and seated'in thefchannels of both bars, a wrist- Vpin bearing membercarried bythe block, a

second blockseated in the said Achannels `of the bars Cand spaced from VVthe `irst'lblock, means for` clamping lthe `blocks tothe bars, a bearingmpvble Vin lthe `said space for' enf pglgnlkfg."fla wrifstlpin opposite the portion In testimony'whereof I aix my signature.

CLYDE S.

`llO 

